struct super_block {struct list_head s_list; /* Keep this first */dev_t s_dev; /* search index; _not_ kdev_t */unsigned char s_blocksize_bits;unsigned long s_blocksize;loff_t s_maxbytes; /* Max file size */struct file_system_type *s_type;const struct super_operations *s_op;const struct dquot_operations *dq_op;const struct quotactl_ops *s_qcop;const struct export_operations *s_export_op;unsigned long s_flags;unsigned long s_iflags; /* internal SB_I_* flags */unsigned long s_magic;struct dentry *s_root;struct rw_semaphore s_umount;int s_count;atomic_t s_active;
#ifdef CONFIG_SECURITYvoid *s_security;
#endifconst struct xattr_handler **s_xattr;
#ifdef CONFIG_FS_ENCRYPTIONconst struct fscrypt_operations *s_cop;struct fscrypt_keyring *s_master_keys; /* master crypto keys in use */
#endif
#ifdef CONFIG_FS_VERITYconst struct fsverity_operations *s_vop;
#endif
#ifdef CONFIG_UNICODEstruct unicode_map *s_encoding;__u16 s_encoding_flags;
#endifstruct hlist_bl_head s_roots; /* alternate root dentries for NFS */struct list_head s_mounts; /* list of mounts; _not_ for fs use */struct block_device *s_bdev;struct backing_dev_info *s_bdi;struct mtd_info *s_mtd;struct hlist_node s_instances;unsigned int s_quota_types; /* Bitmask of supported quota types */struct quota_info s_dquot; /* Diskquota specific options */struct sb_writers s_writers;/** Keep s_fs_info, s_time_gran, s_fsnotify_mask, and* s_fsnotify_marks together for cache efficiency. They are frequently* accessed and rarely modified.*/void *s_fs_info; /* Filesystem private info *//* Granularity of c/m/atime in ns (cannot be worse than a second) */u32 s_time_gran;/* Time limits for c/m/atime in seconds */time64_t s_time_min;time64_t s_time_max;
#ifdef CONFIG_FSNOTIFY__u32 s_fsnotify_mask;struct fsnotify_mark_connector __rcu *s_fsnotify_marks;
#endifchar s_id[32]; /* Informational name */uuid_t s_uuid; /* UUID */unsigned int s_max_links;fmode_t s_mode;/** The next field is for VFS *only*. No filesystems have any business* even looking at it. You had been warned.*/struct mutex s_vfs_rename_mutex; /* Kludge *//** Filesystem subtype. If non-empty the filesystem type field* in /proc/mounts will be "type.subtype"*/const char *s_subtype;const struct dentry_operations *s_d_op; /* default d_op for dentries *//** Saved pool identifier for cleancache (-1 means none)*/int cleancache_poolid;struct shrinker s_shrink; /* per-sb shrinker handle *//* Number of inodes with nlink == 0 but still referenced */atomic_long_t s_remove_count;/** Number of inode/mount/sb objects that are being watched, note that* inodes objects are currently double-accounted.*/atomic_long_t s_fsnotify_connectors;/* Being remounted read-only */int s_readonly_remount;/* per-sb errseq_t for reporting writeback errors via syncfs */errseq_t s_wb_err;/* AIO completions deferred from interrupt context */struct workqueue_struct *s_dio_done_wq;struct hlist_head s_pins;/** Owning user namespace and default context in which to* interpret filesystem uids, gids, quotas, device nodes,* xattrs and security labels.*/struct user_namespace *s_user_ns;/** The list_lru structure is essentially just a pointer to a table* of per-node lru lists, each of which has its own spinlock.* There is no need to put them into separate cachelines.*/struct list_lru s_dentry_lru;struct list_lru s_inode_lru;struct rcu_head rcu;struct work_struct destroy_work;struct mutex s_sync_lock; /* sync serialisation lock *//** Indicates how deep in a filesystem stack this SB is*/int s_stack_depth;/* s_inode_list_lock protects s_inodes */spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp;struct list_head s_inodes; /* all inodes */spinlock_t s_inode_wblist_lock;struct list_head s_inodes_wb; /* writeback inodes */
} __randomize_layout;
